Add 9p support for mounting /home

[dhiltgen]

No description provided.

[jimmidyson]

Any thoughts on this? Would love this for minikube/minishift.

[dhiltgen]

Haven't had the bandwidth to investigate it. Long long ago I played with KVM+9p on a different project and found it was too flaky for what I was trying to do (nested builds within a VM) so I abandoned it. Perhaps things are more stable/reliable now... I'm not sure.

[afbjorklund]

As a workaround, I added a "sshfs"* command: docker/machine#4018
You can use it to mount some machine directory locally (i.e. over SSH).

• https://github.com/libfuse/sshfs

As far as I know* , 9p is deprecated and vsock is emerging...
Which probably leaves NFS or something as the only option.

• https://access.redhat.com/discussions/1119043

[afbjorklund]

The current Boot2Docker image still has 9p support, though.

https://github.com/boot2docker/boot2docker/blob/master/kernel_config

CONFIG_NET_9P=y
CONFIG_NET_9P_VIRTIO=y
# CONFIG_NET_9P_DEBUG is not set
CONFIG_9P_FS=y
CONFIG_9P_FS_POSIX_ACL=y
# CONFIG_9P_FS_SECURITY is not set

Then again it still uses AUFS as the storage driver, as well...

https://github.com/boot2docker/boot2docker/blob/master/Dockerfile

# https://www.kernel.org/
ENV KERNEL_VERSION  4.4.74

# http://aufs.sourceforge.net/
ENV AUFS_REPO       https://github.com/sfjro/aufs4-standalone
ENV AUFS_BRANCH     aufs4.4
ENV AUFS_COMMIT     dcfa30307f2a165069545a0ad2094ca31fcb490b

But maybe 9p is still a reasonable option, until virtio-vsock lands ?
(and even then, it would still need something like NFS on top of it too)

• http://wiki.qemu.org/Features/VirtioVsock

And it looks like there are SELinux things left to sort out, as well...
(even though there might be "Virt-FS" support available in RHEL 7.x)

• https://bugzilla.redhat.com/show_bug.cgi?id=1294884

[afbjorklund]

Using 9p does work OK, but the current boot2docker ISO doesn't mount /hosthome under KVM.

https://github.com/docker/machine/blob/master/drivers/virtualbox/virtualbox_linux.go#L40

https://github.com/docker/machine/blob/master/drivers/virtualbox/virtualbox.go#L445

So it will only mount /Users (Mac) and /C/Users (Win), and only for the VirtualBox driver.

---

To make this work, there are changes needed both for machine (in driver) and for boot2docker.

https://wiki.qemu.org/Documentation/9psetup

-fsdev local,id=test_dev,path=/home/guest/9p_setup/shared,security_model=none -device virtio-9p-pci,fsdev=test_dev,mount_tag=test_mount

 mount -t 9p -o trans=virtio test_mount /tmp/shared/ -oversion=9p2000.L,posixacl,cache=loose

But whole design, with hardcoding /Users /C/Users /home, seems to be a bit flawed anyway ?